The green film covering north-facing siding in Charlotte is not dirt. It is Gloeocapsa magma and related green algae colonies thriving in our warm, humid subtropical climate. When an untrained contractor aims a 3,500 PSI pressure washer nozzle at horizontal siding panels, the blast forces water upward underneath the bottom weep lip. That moisture bypasses the house wrap barrier, enters exterior wall cavities, and saturates fiberglass insulation where it feeds black mold colonies out of sight.
CROWN TOWN GUTTER CLEANING AND POWER WASHING performs true chemical soft washing. We use dedicated low-pressure diaphragm pumping systems that apply cleaning detergents at tap water pressure. The chemistry does the mechanical work of dissolving the algae filaments and neutralizing fungal spores, followed by a wide-angle, high-volume fresh water rinse that carries the dead organic residue away without disturbing a single siding seam.
Service pricing: $150 to $800 per job based on square footage, facade height, architectural complexity, and algae density.
The difference between high pressure and detergent dwell time
High-pressure washing is designed for dense horizontal concrete, not residential siding. When high-pressure water hits painted Hardie plank or vinyl siding, it strips the UV-cured topcoat, leaves visible wand stroke patterns, and gouges caulked window perimeter beads. Even worse, pressure washing only shears off the top layer of surface algae, leaving the root spores embedded in the plastic or fiber pores. Within eight weeks of a high-pressure blast, the green bloom returns thicker than before.
Soft washing addresses the biological cause. Our proportioning system mixes water with sodium hypochlorite and specialized horticultural surfactants. When sprayed onto siding, the surfactant creates a dense foam that clings to vertical surfaces for ten minutes without drying. The solution penetrates microscopic substrate fissures, breaking the biological bond and sterilizing the spores completely.
Substrate compatibility: vinyl, painted wood, Hardie plank, brick, and stucco
Charlotte homes feature a diverse mix of cladding materials, often combined on a single elevation. A technician must adjust water volume, spray nozzle fan degree, and chemical strength for each individual surface:
- Horizontal Vinyl Siding: Extremely flexible with interlocking channels. Requires downward-directed fan spray under 250 PSI to avoid forcing water into weep channels.
- James Hardie Fiber Cement: Factory baked-on finishes can chalk if hit with aggressive pressure. Soft washing preserves the paint warranty while dissolving mildew.
- Red Clay Masonry & Brick: Historic Carolina brick has soft mortar joints. Soft wash detergents penetrate deep into mortar pores, killing black mold without eroding lime binders.
- Synthetic Stucco (EIFS): Highly sensitive to mechanical abrasion. Any high-pressure contact creates holes in the acrylic finish. Sub-300 PSI chemical washing is the only manufacturer-approved cleaning technique.
“Blasting vinyl siding with four thousand pounds of pressure drives water behind the vapor barrier; we use low-pressure detergent dwell and gentle rinses.” Sergey • Field Lead, Crown Town
We also treat exterior soffits, aluminum fascia boards, porch ceilings, and window surrounds. Eaves and gutters harbor spiders, dirt-dauber wasp nests, and airborne highway soot that cannot be removed with water alone. Our foaming detergents break these organic oils cleanly.
Comprehensive landscape and electrical protection protocol
Property owners are understandably worried about their foundation plantings and exterior fixtures. Cleaning solutions that kill algae can damage delicate ornamental plants if applied carelessly. Sergey follows a rigorous 3-step plant protection procedure:
| Protection Phase | Standard Action Taken on Site | Purpose |
|---|---|---|
| Pre-Wash Saturate | Continuous fresh-water soaking of all root zones and leaves | Hydrated plant cells cannot absorb secondary wash solution |
| Hardware Shielding | Weatherproof tape seals placed over outdoor outlets and camera lenses | Prevents electrical shorts, ground faults, and lens clouding |
| Post-Wash Rinse | Copious fresh-water rinse across turf, flower beds, and shrubs | Dilutes any residual mist down to neutral ground fertilizer levels |
Combining house washing with gutter and driveway care
While our service rig is connected to your outdoor water supply on Eversfield Lane or anywhere in Mecklenburg County, it is most economical to address the entire exterior envelope in one visit. If your gutters are choked with pine needles, consider adding our Gutter Cleaning & Downspout Flush ($129–$400). If your concrete driveway shows dark tire marks, add our rotary Driveway Pressure Washing ($120–$200). We apply a 10% multi-service discount on combined scopes.
Request your written facade soft wash estimate
Submit your home address below. Sergey checks your exterior wall square footage and siding material via satellite imagery and responds with a fixed quote within four business hours.